public PartialViewResult SelectInventory(int requestNumber) { IEnumerable <InventoryModel> inventoryList = null; if (requestNumber < 0) { inventoryList = _inventoryProvider.GetAllData(); } else { inventoryList = _inventoryProvider.GetInventoryNotInRequest(requestNumber); } if (inventoryList != null) { return(PartialView(inventoryList)); } else { return(null); } }